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Old 12-10-2004, 10:05 PM   #7
BADGMC
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Join Date: Jan 2004
Location: Duluth, Mn
Posts: 162
Big thing is that the older heads were a lot more heavy duty than the newer smog heads and many had smaller chambers for more compression. There is a lot more meat for porting and such to get more flow and compression which equals more power out of them. As for the 305 heads the two castings to look for are the 416 and 601 castings. These were the ones on the high output 305's in the 80's. But remember they are thinner castings so you can't do too much with them. I had 601's on my 305 in my 85 and with an intake, cam, and headers with good exhaust it ran mid 15's and surprised more than a few 350 powered trucks.
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85 GMC 1/2 ton LWB 4150lbs.
383 SBC with Twin MPT70 Turbos 850 CSU carb
TH375 3.70 gears Ultimate 10" Converter
10.11@136.6 with 1.64 60ft. on 10.5-31-15W
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